/*
 *
 *  Copyright (C) 2010 Tal Eisenberg
 *
 *  This program is free software: you can redistribute it and/or modify
 *  it under the terms of the GNU General Public License as published by
 *  the Free Software Foundation, either version 3 of the License, or
 *  (at your option) any later version.
 *
 *  This program is distributed in the hope that it will be useful,
 *  but WITHOUT ANY WARRANTY; without even the implied warranty of
 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *  GNU General Public License for more details.
 *
 *  You should have received a copy of the GNU General Public License
 *  along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */

package base;

import tal.drivechain.matchers.VarMatcher;
import tal.drivechain.plugin.Channel;
import tal.drivechain.plugin.Module;
import tal.drivechain.variable.SetProperty;
import tal.drivechain.variable.Variable;

/**
 *
 * @author Main
 */
public class Direction extends Module {
    Variable up, down;
    VarMatcher trigger;
    double reference = 0;
    int lastDirection = 0;
    boolean hasReference = false;
    
    @Override
    public void setupProperties() throws IllegalArgumentException {
        try {
            trigger = (VarMatcher)props.getProperty("trigger");
            up = (Variable)props.getProperty("onUp");
            down = (Variable)props.getProperty("onDown");
        } catch (IllegalArgumentException ie) {
            log(ie.getMessage(), MSG.ERROR);
        }
    }

    public void setTrigger(Object value, SetProperty.Flag flag) {
        trigger = (VarMatcher)value;
    } public Object getTrigger() { return trigger; }
    
    public void setOnUp(Object value, SetProperty.Flag flag) {
        up = (Variable)value;
    } public Object getOnUp() { return up; }
    
    public void setOnDown(Object value, SetProperty.Flag flag) {
        down = (Variable)value;
    } public Object getOnDown() { return down; }
    
    @Override
    protected void msgReceived(Variable in, long timestamp, Channel channel) {
        if (trigger.matches(in, channel, this)) {
            Object value = in.getValue(this);
            double val;
            if (value instanceof Number)
                val = ((Number)value).doubleValue();
            else { 
                log("Received matching variable of invalid type: " + in.toString(this), MSG.WARNING);
                return;
            }
            
            if (hasReference) {
                int direction;
                if (val > reference)
                    direction = 1;
                else if (val == reference)
                    direction = 0;
                else
                    direction = -1;
                if (debugFlag) log("direction=" + direction + " reference=" + reference, MSG.DEBUG);
                if (direction!=lastDirection) {
                    if (direction == 1) {
                        this.sendToOutputs(up, timestamp);
                        if (debugFlag) log("Direction changed to up", MSG.DEBUG);
                    } else if (direction == -1) {
                        this.sendToOutputs(down, timestamp);
                        if (debugFlag) log("Direction changed to down", MSG.DEBUG);
                    }
                }
                lastDirection = direction;                
            } else
                hasReference = true;
            reference = val;
            if (debugFlag) log("Saving reference value of " + reference, MSG.DEBUG);
        }
    }

}
